Cov ntaub ntawv refractory uas suav nrog chromium feem ntau yog liam rau cov pa phem ntawm cov ntaub ntawv refractory hauv cov cement sector. Chromium-muaj cov ntaub ntawv refractory yuav raug hloov pauv ib nrab ntawm Cr3+ mus rau Cr6+ ntawm qhov kub tshwj xeeb thaum lawv raug oxidizing ib puag ncig thiab alkaline oxides. Cement yog ua ke nrog cov khoom siv refractory. Kev kho ntau dhau ntawm cov khib nyiab cib uas muaj chromium tseem yuav ua rau cov dej hauv av, thiab cov qib chromium ntawm cov cement hauv clinker kuj yuav dhau tus qauv. Periclase-spinel cib, magnesia-hlau spinel cib, thiab magnesia hlau aluminium composite spinel cib yog tus thawj coj chromium-dawb refractories tam sim no tau tsim rau thaj tsam tua ntawm cov cement kilns.
Dab tsi yog cov khoom ntxiv ntawm magnesia hlau aluminium composite spinel bricks?
1. Muaj zog tiv thaiv corrosion
Magnesia-hlau-aluminium composite spinel bricks tau txhim kho corrosion kuj vim tias lawv yog cov purer thiab muaj cov ntaub ntawv uas tsis tshua muaj melting, uas yog muab faib rau hauv daim duab peb sab-zoo li qhov chaw nruab nrab ntawm cov muaju. Secondary spinel yog tsim thaum MgO ua ke nrog Al2O3, Fe2O3, los yog FeO ntawm hlau-aluminium spinel ntawm qhov kub ntawm kev tua thiab siv. Ib qho me me ntawm qhov ntim nthuav dav tshwm sim nrog rau cov tshuaj tiv thaiv, txhim kho cov khoom compactness thiab tiv thaiv cov cement los ntawm ib feem ntawm melting. khoom sifting.
2. Zoo dai kiln ntawm daim tawv nqaij ua haujlwm
Cov cement raw khoom melts ntawm qhov kub thiab txias, reacts nrog nto ntawm refractory cib, nkag mus rau hauv lub cib los ntawm lawv lub qhov hws, solidifies ntawm qhov kub ntawm 1200 ° C, thiab tsim ib tug thawj kiln daim tawv nqaij nrog ib tug "mechanical anchoring" nyhuv. Cov tawv nqaij pib pib tom qab ntawd koom nrog cov khoom siv clinker kom maj mam thicken cov tawv nqaij. Hlau-aluminate, aluminate, thiab silicate ua rau feem ntau ntawm daim tawv nqaij. Al2O3, Fe2O3, los yog FeO muaj nyob rau hauv cov magnesia hlau aluminium composite spinel cib nyob rau hauv ntau yam. Kev tsim lub network ruaj khov yuav tsum muaj tus nqi A / F zoo. Cov tawv nqaij kiln ua haujlwm raws li kev tiv thaiv.
3. Zoo thermal shock kuj
magnesia hlau aluminium composite spinel cib muaj periclase, hlau-aluminium spinel, magnesium-hlau spinel, magnesium-aluminium spinel thiab lwm theem. Vim muaj qhov sib txawv thermal expansion coefficients ntawm ntau theem, cov khoom siv sab hauv muaj ntau tus microcracks, uas ua rau kom cov khoom toughness.
4. Tsawg thermal conductivity
Cov cement kiln hauv ob sab phlu cib yog ua los ntawm ib txheej. Lub sij hawm ntev kub kub lub cev ua haujlwm yuav ua rau lub cev lub tog raj kheej deform thiab muaj kev cuam tshuam rau lub kiln ua haujlwm zoo li cas. magnesia hlau aluminium composite spinel cib yog cov khoom siv ntau theem nrog cov thermal conductivity tsawg uas tuaj yeem txo lub tog raj kheej lub cev kub. Cov cement kiln qhov kub ntawm qhov chaw yuav raug txo qis, kev siv roj tuaj yeem txo tau raws li, thiab cov xwm txheej zoo tuaj yeem tsim los txhim kho cov cement kiln qhov kev ua haujlwm thiab kev pab cuam lub neej.
